here, and click R-x.x.x.dmg (x.x.x is a version number). Double click the downloaded disk image, and double click R.mpkg, and follow the instructions.
here, click ``Downlad R x.x.x for Windows'', and follow the direction of installer. I don't know much about Windows, but it was pretty simple.
install.packages()inside of R.
> install.packages("ape", dependencies = TRUE)This will automatically download and install the package ``ape''.
> library("nlme")Note that package ``nlme'' is included in the default installation, so you did not need to install it before you use it.